This publication is a summary of the records of food plants used by the Indians of the United States and Canada which have appeared in ethnobotanical publications during a period of nearly 80 years. -- First sentence from foreword.

"Dietary diversity, is the variety of foods and food groups in a person's or household's diet. Dietary diversity is one way to assess the nutritional quality of adequacy of diets and reflects access to a variety of foods" -front page.